Thursday, July 4th.  The boat was now completed except what is in fact the most difficult part, the making her seams secure.  We had intended to despatch a canoe with part of our men to the United States early this spring; but not having yet seen the Snake Indians, or knowing whether to calculate on their friendship or enmity, we have decided not to weaken our party which is already scarcely sufficient to repel any hostility.  We were afraid too that such a measure might dishearten those who remain; and as we have never suggested it to them, they are all perfectly and enthusiastically attached to the enterprise, and willing to encounter any danger to ensure its success.  We had a heavy dew this morning.

Since our arrival at the falls we have repeatedly heard a strange noise coming from the mountains in a direction a little to the north of west.  It is heard at different periods of the day and night, sometimes when the air is perfectly still and without a cloud, and consists of one stroke only, or of five or six discharges in quick succession.  It is loud and resembles precisely the sound of a six pound piece of ordnance at the distance of three miles.  The Minnetarees frequently mentioned this noise like thunder, which they said the mountains made; but we had paid no attention to it, believing it to have been some superstition or perhaps a falsehood.  The watermen also of the party say that the Pawnees and Ricaras give the same account of a noise heard in the Black mountains to the westward of them.  The solution of the mystery given by the philosophy of the watermen is, that it is occasioned by the bursting of the rich mines of silver confined within the bosom of the mountain.  An elk and a beaver are all that were killed to-day:  the buffaloe seemed to have withdrawn from our neighbourhood, though several of the men who went to-day to visit the falls for the first time, mention that they are still abundant at that place.  We contrived however to spread not a very sumptuous but a comfortable table in honour of the day, and in the evening gave the men a drink of spirits, which was the last of our stock.  Some of them appeared sensible to the effects of even so small a quantity, and as is usual among them on all festivals, the fiddle was produced and a dance begun, which lasted till nine o’clock, when it was interrupted by a heavy shower of rain.  They continued however their merriment till a late hour.

Friday 5.  The boat was brought up into a high situation and fires kindled under her in order to dry her more expeditiously.  Despairing now of procuring any tar, we formed a composition of pounded charcoal with beeswax and buffaloe tallow to supply its place; should this resource fail us it will be very unfortunate, as in every other respect the boat answers our purposes completely.  Although not quite dry she can be carried with ease by five men; her form is as complete as could be wished; very strong, and will carry at least eight thousand pounds with her complement of hands.  Besides our want of tar, we have been unlucky in sewing the skins with a needle which had sharp edges instead of a point merely, although a large thong was used in order to fill the hole, yet it shrinks in drying and leaves the hole open, so that we fear the boat will leak.